LOS ANGELES (AP) – A loud auto crash that some passengers thought was shots being fired and an anonymous call reporting a gunman prompted evacuations Friday night at two terminals of Los Angeles International Airport.

The incidents occurred just three weeks after a gunman killed a security officer and injured three other people at the airport.

Airport police Chief Patrick Gannon said the sound of the crash spurred reports of gunfire among the passengers inside Terminal 5, many of whom ran outside. Police said a driver with a medical emergency caused the crash, which injured three.

In neighboring Terminal 4, airport police received an anonymous call just after the crash reporting a gunman.

Police ordered a complete evacuation of both terminals, but no gunman was found.

Several departing flights were delayed as passengers returned to their gates.